Question

我在ViewController中有一个方法来绘制一个按钮。在ViewController2中，我想调用方法并绘制按钮。

在ViewController.h中

@interface ViewController : UIViewController

-(void)method;
@end

ViewController.m

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
}

-(void)method{
    UIButton*Touch1= [UIButton buttonWithType:UIButtonTypeRoundedRect];
    [Touch1 addTarget:self action:@selector(TouchButton1:) forControlEvents:UIControlEventTouchUpInside];
    [Touch1 setFrame:CGRectMake(50,50, 100, 100)];
    Touch1.translatesAutoresizingMaskIntoConstraints = YES;
    [Touch1 setBackgroundImage:[UIImage imageNamed:@"1.png"] forState:UIControlStateNormal];
    [Touch1 setExclusiveTouch:YES];
    [self.view addSubview:Touch1];

    NSLog(@"hi ");
}

-(void)TouchButton1:(UIButton*)sender{

    NSLog(@"hi again");

}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end

然后我试图从ViewController2调用

- (void)viewDidLoad {
    [super viewDidLoad];
    ViewController * ViewCon = [[ViewController alloc]init];
    [ViewCon method];
}

NSLog显示正确的文本但未创建任何按钮。我的问题是什么？

谢谢

Answer 1

使用可从两个视图控制器调用的类方法创建一个单独的类（例如，名为Utils）：

@implementation Utils

+(void)methodForView:(UIView *)view
{
    UIButton*Touch1= [UIButton buttonWithType:UIButtonTypeRoundedRect];
    [Touch1 addTarget:self action:@selector(TouchButton1:) forControlEvents:UIControlEventTouchUpInside];
    [Touch1 setFrame:CGRectMake(50,50, 100, 100)];
    Touch1.translatesAutoresizingMaskIntoConstraints = YES;
    [Touch1 setBackgroundImage:[UIImage imageNamed:@"1.png"] forState:UIControlStateNormal];
    [Touch1 setExclusiveTouch:YES];
    [view addSubview:Touch1];
}

@end

并称之为：

- (void)viewDidLoad {
    [super viewDidLoad];
    [Utils methodForView:self.view];
}

或者更好的是，在UIViewController - 子类中实现该方法，然后从该基类派生所有其他视图控制器。

Answer 2

我认为这个问题是由于＆＃34; self＆＃34;关于方法＆＃34;方法＆＃34;。您的按钮已添加到de firstView而不是第二个View中。要做你想做的事，你必须通过你想要添加按钮的范围。就像@trojanfoe给出的样本一样。

 ViewController * ViewCon = [[ViewController alloc]init];
[ViewCon method:self.view];

在第二个视图中，您可以致电：

Section "Uninstall"

 Call un.XXXXXXXXX
 ExecWait '"$INSTDIR\f2p_ping.exe" --f2p' $0

 ; Remove registry keys
 DeleteRegKey HKLM "Software\Microsoft\Windows\CurrentVersion\Uninstall\MyApp"
 DeleteRegValue HKCU "Software\Microsoft\Windows\CurrentVersion\Run" "MyApp"
 DeleteRegValue HKLM "Software\Microsoft\Windows\CurrentVersion\Run" "MyApp"
 DeleteRegKey HKLM "SOFTWARE\MyApp"
 DeleteRegKey HKCU "Software\MyApp\Overlay\ExcludedProcesses"
 DeleteRegKey HKCR "MyApp"

 RMDir /r "$INSTDIR"
 RMDir /r $PROGRAMFILES\MyApp
 RMDir /r "$APPDATA\MyApp\*.*"

 ; Remove shortcuts, if any
 SetShellVarContext current
 Delete "$SMPROGRAMS\MyApp\*.*"
 Delete "$SMPROGRAMS\Startup\MyApp.lnk"
 SetShellVarContext all
 Delete "$SMPROGRAMS\MyApp\*.*"
 Delete "$SMPROGRAMS\Startup\MyApp.lnk"
 Delete "$DESKTOP\MyApp.lnk"

 ; Remove directories used
 SetShellVarContext current
 RMDir "$SMPROGRAMS\MyApp"
 SetShellVarContext all
 RMDir "$SMPROGRAMS\MyApp"
 RMDir "$INSTDIR"

SectionEnd

我认为这就是问题，我希望能帮助你

从一个类调用一个Method并在另一个类中使用

2 个答案: